library/core/src/char/methods.rs

@@ -1765,10 +1765,10 @@ const fn len_utf8(code: u32) -> usize {
 pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] {
     const fn panic_at_const(_code: u32, _len: usize, _dst_len: usize) {
         // Note that we cannot format in constant expressions.
-        panic!("encode_utf8: buffer does not have enough bytes to encode code point")
+        panic!("encode_utf8: buffer does not have enough bytes to encode code point");
     }
     fn panic_at_rt(code: u32, len: usize, dst_len: usize) {
-        panic!("encode_utf8: need {len} bytes to encode U+{code:04X} but buffer has just {dst_len}")
+        panic!("encode_utf8: need {len} bytes to encode U+{code:04X} but buffer has just {dst_len}");
     }
     let len = len_utf8(code);
     match (len, &mut *dst) {
@@ -1790,6 +1790,7 @@ pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] {
             *c = (code >> 6 & 0x3F) as u8 | TAG_CONT;
             *d = (code & 0x3F) as u8 | TAG_CONT;
         }
+        // FIXME(const-hack) We would prefer to have streamlined panics when formatters become const-friendly.
         _ => const_eval_select((code, len, dst.len()), panic_at_const, panic_at_rt),
     };
     // SAFETY: `<&mut [u8]>::as_mut_ptr` is guaranteed to return a valid pointer and `len` has been tested to be within bounds.